Bipolar Driver IC SI-7230M ■ Ratings (Ta = 25°C) Absolute maximum rating Supply voltage Peak voltage of pins C A and CB (V) (V) Output current Junction temperature (°C) (A) Operating ambient temperature (°C) Storage temperature (°C) Type No. VCC1 V CC2 V SP Io Tj Top Tstg SI-7230M 50 7 70 3.2 +125 –20 to +80 –30 to +100 ■ Characteristics Electrical characteristics Supply voltage Output current (V) (mA/ø) V CC1 V CC2 Type No. min typ max min SI-7230M 15 30 45 *Comparator threshold voltage 4.5 IO (V) I OM typ max min max min 5 5.5 200 3000 535 Excitation signal input voltage (V) V THF typ max min VTHPD typ max min VIL(ON) Excitation signal input current (mA) Oscillation frequency V CC2 input current (kHz) (mA) IIL F VIH(OFF) max min typ max max V CC2 VCC2 –0.4 +2 1.6 19 21 150 580 625 1.025 1.125 1.225 0.515 0.555 0.595 0 0.5 * VTHF : Conditions shown in the standard external connection diagram with VCC2 = 5V and R S = 1Ω VTHPD : Conditions shown in the standard external connection diagram with R X = 1kΩ, V CC2 = 5V and RS = 1Ω ■ Block diagram Auxiliary power supply VCC2 Reference voltage Variable current resistor Rx Main power supply VCC1 Comparator amplifiter Current controller M Trigger pulse generator circuit Excitation signal amplifier Excitation signal (4-phase) Counter EMF Canceller SI-7230M + CA, CB Current detection resistor RS ■ Equivalent circuit diagram AIN 7 CA 2 AOAO 4 5 AIN 8 BIN 15 BO BO 18 17 CB 20 BIN 14 D10 1 VCC1 D9 R1 10 VCC2 R2 Tr1 R3 Tr2 Tngger pulse generator circoit R49 11 VREF R5 VrefA G 12 13 VrefB 50 – + D2 R37 R38 Tr10 R10 R11 R6 R7 Tr13 R21 R29 Tr5 R30 Tr14 R22 R42 R44 R48 1C2/2 R45 Tr17 Tr18 R33 R18 R34 6 3 RSA G R39 R40 D4 Tr12 R8 R28 R15 R14 Tr6 D3 R27 R26 D5 D6 Tr4 R12 Tr11 R25 R43 R41 R47 D1 R13 R50 9 Tr9 R4 Tr3 R9 Tr15 R23 R16 D7 D8 R31 Tr7 Tr8 R32 Tr16 R24 R19 1C1/2 R46 Tr19 R20 Tr20 R35 R36 6 19 RSB G ICC2 typ max min max min max 25 SI-7230M ■ External dimensions (Unit: mm) Plastic package 69.0±0.5 7.0±0.5 63.0±0.4 3.5 3.8 16.6 Type No. Lot No. 8.0 φ 1.8 35.0±0.5 SI-7230M 8.6±1 3.4 3 0.5 P = 2.54 Pin No. 1.4 12....................................20 ■ Standard external connection diagram VCC2 Excitation signal input Active Low + 22µF 10V AIN AIN BIN BIN A A B B VCC2 10 7 8 15 14 SI-7230M 11 VREF VrefA 9 VrefB 13 AO 5 18 BO 17 2 PD (Power down) 6 IO CA + 10µF 100V 20 CB 1612 3 19 + 10µF 100V 2SC2002 VCC1 BO 10K RX + 100µF 100V VCC1 1 IO AO 4 RSA RSB G * For details on the characteristics and thermal design, refer to the technical manual. 51 SI-7230M Application Note ■ Power down mode ■ Determining the output current IO (motor coil current) The output current, IO is fixed by the following elements: RS : Current detection resistor VCC2 : Supply voltage RX : Variable current resistor To operate a motor at maximum current level, set R X to infinity (open). To compute I O when different values are used for RS and VCC2, use the approximation formula below. The maximum ripple value I OH of the output current waveform can be computed as follows: 1 (0.233•VCC2–0.026) [A] IOH(max) = RS 1 (0.214•VCC2–0.021) [A] IOH(min) = RS The graph of the equations above is shown below. IOH Waveform of the output current SI-7230M Output current IOH vs. Current detection resistor Rs Output current IOH (A) 3 1 (0.233VCC2 – 0.026) RS IOH(min) = 1 (0.214VCC2 – 0.021) RS 2 IOH(max) = SI-7230M can be operated in power down mode. The circuit is shown below. When transistor Tr is switched on, the reference voltage drops and the output current can be decreased. 9 11 13 SI-7230M RX Tr ■ Surge absorption capacitor C A and CB and capacitance The upper diagram shown on the next page is the flow of the counter EMF produced by the motor coils when it charges CA and CB and the lower diagram shows the direction of the energy discharged by C A and C B. When phase A shown in the figure is off, the counter EMF (energy built-up by the coil inductance) produced by the motor coils passes through the path shown by the dotted lines and charges CA and CB. When phase A is on, the energy stored by the capacitors are discharged in the direction shown by the dotted lines in the lower left diagram on the next page. The capacitors are discharged until the voltage across their pins equal the supply voltage VCC. The peak voltage V SP across the capacitors is given by the equation: VSP = L •IO + VCC C where, L : Motor coil inductance between pins 4 and 5 or pins 18 and 17 1 C : Capacitance of C A and C B IO : Output current 0 0 1 2 3 4 Current detection resistor Rs (Ω) SI-7230M Output current IOH vs. Variable current resistor Rx 3 Output current IOH (A) RS = 0.3Ω RS = 0.6Ω 1 1 IOH(max) = RS IOH(min) = 1 RS 1 2 1.131 4.9 VCC2 – 0.026 4.843 + RX 1.107 51 VCC2 – 0.021 5.165 + RX 3 Variable current resistor Rx (kΩ) 52 (1) V SP must not exceed the breakdown voltage of the hybrid IC (70V). (2) C A and CB are charged/discharged in the same rate as the phase is switched. Hence, a capacitor with excellent anti-ripple characteristics should be selected. 2 0 0 An example waveform of VSP is shown in the middle figure on the next page. A VSP that can be obtained when high voltage is applied can also be produced by using the counter EMF when the coil current rises. Notes in selecting C A and CB. 4 SI-7230M Application Note Charging path of the counter EMF Example VSP waveform VCC CA or CB + IOFF – A 10V/div A VCC VSP L A A VCC = 30V IO = 0.7A/φ 1-2 phase excitation 950PPS 1 ms/div Discharge path of the counter EMF VCC CA or CB + ION – A A L A A Torque vs. Response frequency Pull-out torque τOUT (kg·cm) 5 4 With external capacitor . CA, B =3.3 . µF/100V Without external capacitor Pins q-w-@0pin shorted Measurement conditions VCC1 = 35V, VCC2 = 5V IO = 2.5A/φ 2-phase excitation Motor : 23LM-CO35 (Manufactured by Minevea) Motor connection A 3 B 2 1 A 0 100 500 1K 2K 5K 10K X B X X : Open Response frequency f (pps) 53 SI-7200M, SI-7230M, SI-7115B, SI-7300A, SI-7330A, SI-7500A and SI-7502 Handling Precautions (Note: The SI-7502 is applicable for item (2) only.) For details, refer to the relevant product specifications. (1) Tightening torque: The torque to be applied in tightening screws when mounting the IC on a heatsink should be below 49N•m. (2) Solvent: Do not use the following solvents: Substances that Chlorine-based solvents : Trichloroethylene, dissolve the package Trichloroethane, etc. Aromatic hydrogen compounds : Benzene, Toluene, Xylene, etc. Ketone and Acetone group solvents Substances that weaken the package Gasoline, Benzine and Kerosene (3) Silicone grease: The silicone grease to be used between the aluminum base plate of the hybrid IC and the heatsink should be any of the following: • G-746 SHINETSU CHEMICAL INDUSTRIES CO., LTD. • YG6260 TOSHIBA SILICONE CO., LTD. • SC102 DOW CORNING TORAY SILICONE CO., LTD. Please pay sufficient attention in selecting silicone grease since oil in some grease may penetrate the product, which will result in an extremely short product life. Others • Resistance against radiation Resistance against radiation was not considered in the development of these ICs because it is assumed that they will be used in ordinary environment. 54